\documentclass{article}
% Comment the following line to NOT allow the usage of umlauts
\usepackage[utf8]{inputenc}
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%\usepackage[document]{ragged2e}
\usepackage[a4paper, lmargin=1.5cm, rmargin=1.5cm, bottom=1.5cm]{geometry}
%\usepackage{graphicx}
\usepackage{color}
\usepackage{amsmath}
\usepackage[T1]{fontenc}
\usepackage{amsfonts} \usepackage{amssymb}
\usepackage{cancel}
\usepackage{fancybox}
\usepackage[all]{xy}
\usepackage{pst-all}
\usepackage{tikz}
\usepackage{gnuplottex}
\tikzset{flippedeventlabel/.append style={align=center}}
\usetikzlibrary{matrix.skeleton}
\usetikzlibrary[shapes,arrows,positioning,fit,backgrounds,intersections,shadows,calc]
\usetikzlibrary{positioning} \usetikzlibrary{decorations.text} \usetikzlibrary{decorations.pathmorphing} 
%Paquete para Referencias Web
\usepackage [colorlinks=true,linkcolor=green! 40!blue,citecolor=green!40!blue,filecolor=magenta, urlcolor= blue]{hyperref}
%Paquete de estilo de Referencias
\urlstyle{same}
\usepackage{pgfplots}
\pgfplotsset{compat=newest}
\usetikzlibrary{datavisualization} \usetikzlibrary[shapes,arrows,positioning,fit,backgrounds,intersections,shadows,calc,datavisualization.formats.functions]
\usetikzlibrary{patterns}
\usepackage{circuitikz}
\title{UN CIRCUITO SENCILLO CON\\ \bf\texttt{circuitikz}}
\author{Nimrod Rodríguez\\ \small{nimrodga@hotmail.com}}

\date{}
% Start the document

\begin{document}
\maketitle
\begin{circuitikz} [orange,information text/.style={rounded corners,fill=blue!18,inner sep=1ex}]
\draw node [rotate=45] at (0,1) {\bf\color{blue}{\tiny{relay}}};
\draw (0,0) to[twoport](0,2);
\draw (0.5,1) to[short, -o](1.3,1);
\draw [-, black](-0.5,1) to[short, -o](-1.1,1) to (-1.1,-3);
\draw node at (0,1.3) {\color{red}{\tiny{30}}};
\draw node at (0,0.7) {\color{red}{\tiny{87}}};
\draw node at (0.3,1) {\color{red}{\tiny{85}}};
\draw node at (-0.3,1) {\color{green!30!blue}{\tiny{86}}};
\draw [red] (0,2) to (-1.7,2) to [fuse,l_=\SI{10}{Amp}, fill=red] (-1.7,0.5)  to[battery2= , invert={+}{-}, l_=\SI{12}{V}, black] (-1.7,-3)node[ground, black
]{-};
\draw [-, black] (-1.7,-1.4) to (-1.7,-3);
\draw [->](4,3.25) to (1.3,3.25) to [switch, l_={Interruptor}](1.3,2.5) to (1.3,1) ;
\draw (0.5,-1) [lamp,yellow];
\draw (0,0) to (0,-1) to (1,-1) to [lamp,l_=\SI{55}{W}, fill=yellow] (1,-3);
\draw (1,-1) to (2.8,-1) to [lamp,l_=\SI{55}{W}, fill=yellow] (2.8,-3);
\draw node at (-1.5,-0.9) {$\textcolor{red}{+}$};
\draw node at (-1.5,-1.6) {$\textcolor{blue}{-}$};
\draw node at (-2.5,0.9) {\textcolor{red}{Seguro}};
\draw node at (3,-1.2) {$i_0$};
\draw node at (1.2,-1.2) {$i_0$};
\draw [black](2.8,-3) to (1,-3) to (-1.7,-3);
\draw node at (-1.7,-3.8) {Masa};
\draw  (4,2.5) circle [radius=0.75cm, green!25] node[very thick, black] {|};
\draw  node at (3.3,2.8) {\bf\color{black}{\tiny{•}}};
\draw  node at (3.6,2.6) {\bf\color{black}{\tiny{ACC}}};
\draw  node at (4,3.25) {\bf\color{black}{\tiny{•}}};
\draw  node at (4,3.1) {\bf\color{black}{\tiny{IGN}}};
\draw  node at (4.5,3.05) {\bf\color{black}{\tiny{•}}};
\draw  node at (4.35,2.8) {\bf\color{black}{\tiny{start}}};
%Flujos
\draw [->,red] (3,3.4) to (2,3.4);
\draw [->,red] (-1,2.2) to (-0.5,2.2);
\draw [->,red] (-2,-1) to (-2,-0.5);
\draw [->,red] (0.2,0) to (0.2,-0.5) node [right]{\color{blue}{$i$}};
\draw [->, black] (1,-3.2) to (0.6,-3.2);


%Leyenda de cableado
\draw [-,red,very thick](-1.5,-4.5) to (-1,-4.5);
\draw  (0,-4.5) node {\color{black}{Calibre 12}};
\draw [-, orange,very thick](-1.5,-5) to (-1,-5);
\draw  (0,-5) node {\color{black}{Calibre 20}};
\draw[xshift=1.85cm,black!90]
node[right=3.2cm,text width=7cm,information text]
{
\begin{minipage}{6.8cm}
\begin{center}
\shadowbox{\texttt{\textcolor{blue}{\LARGE{circuitikz}}}} \\
\end{center}
\textcolor{blue}{\LARGE{L}}a figura muestra la conexión de dos bulbos o bombillos neblineros de 55 watts cada uno, como los del tipo H-11 comunmente utilizado, vía un relé (bobina) tipo comercial, cuya figura (la de un inductor en la librería \texttt{\textcolor{blue!60!red}{\textbackslash usepackage}\textcolor{blue}{\{circuitikz\}}} aparece con la numeración de terminales, la cual normalmente traen como guía de conexión. El calibre del cableado es según la tabla de ampacidad y esta se utiliza a partir de los valores en las relaciones 
\begin{align*}
V =iR, \hspace{0.5cm} P = i_0V,
\end{align*}
entendiéndose que en ambas la tensión\linebreak $V$ = 12 volts, mientras que la resistencia $R$ en la primera, es la del conductor que soporta $i$ amperios, que es la corriente combinada o resultante del consumo en las lámparas en paralelo de $i_0$ amperios de corriente y potencia $P$ = 55 watts cada una. Solo hay que recordar que la medida $AWG$ es, como suele decirse, \textbf{\textit{contra-intuitiva}}, pues cuanto mayor es el calibre, más delgado es cable. 
\end{minipage}
};
\end{circuitikz}
\end{document}